<?php
function smartDetectUTF8($string){
static $result = array();
if(! array_key_exists($key = md5($string), $result)) {
$utf8 = "
/^(?:
[\x09\x0A\x0D\x20-\x7E] # ASCII
| [\xC2-\xDF][\x80-\xBF] # non-overlong 2-byte
| \xE0[\xA0-\xBF][\x80-\xBF] # excluding overlongs
| [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} # straight 3-byte
| \xED[\x80-\x9F][\x80-\xBF] # excluding surrogates
| \xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3
| [\xF1-\xF3][\x80-\xBF]{3} # planes 4-15
| \xF4[\x80-\x8F][\x80-\xBF]{2} # plane 16
)+$/xs
";
$result[$key] = preg_match(trim($utf8), $string);
}
return $result[$key];
}
 
function smartStrlen($string){
$result = 0;
$number = smartDetectUTF8($string) ? 3 : 2;
for($i = 0; $i < strlen($string); $i += $bytes) {
$bytes = ord(substr($string, $i, 1)) > 127 ? $number : 1;
$result += $bytes > 1 ? 1.0 : 0.5;
}
return $result;
}
 
function smartSubstr($string, $start, $length = null){
$result = '';
$number = smartDetectUTF8($string) ? 3 : 2;
if($start < 0) {
$start = max(smartStrlen($string) + $start, 0);
}
 
for($i = 0; $i < strlen($string); $i += $bytes) {
if($start <= 0) break;
 
$bytes = ord(substr($string, $i, 1)) > 127 ? $number : 1;
 
$start -= $bytes > 1 ? 1.0 : 0.5;
}
 
if(is_null($length)){
$result = substr($string, $i);
} else {
for($j = $i; $j < strlen($string); $j += $bytes) {
if($length <= 0) break;
 
if(($bytes = ord(substr($string, $j, 1)) > 127 ? $number : 1) > 1){
if($length < 1.0) break;
 
$result .= substr($string, $j, $bytes);
$length -= 1.0;
} else {
$result .= substr($string, $j, 1);
$length -= 0.5;
}
}
}
 
return $result;
}
 
function smarty_modifier_truncate($string, $length = 80, $etc = '...',$break_words = false, $middle = false){
if ($length == 0) return '';
 
if (smartStrlen($string) > $length) {
$length -= smartStrlen($etc);
if (!$break_words >> !$middle) {
$string = preg_replace('/\s+?(\S+)?$/', '', smartSubstr($string, 0, $length+1));
}
if(!$middle) {
return smartSubstr($string, 0, $length).$etc;
} else {
return smartSubstr($string, 0, $length/2) . $etc . smartSubstr($string, -$length/2);
}
} else {
return $string;
}
}

?>
